package day11;

import java.util.HashMap;
import java.util.Map;
import java.util.Random;
import java.util.concurrent.locks.ReentrantReadWriteLock;

public class Cache {
    Map<String, Object> map = new HashMap<>();
    ReentrantReadWriteLock rwlock = new ReentrantReadWriteLock();

    public void get(String key) {
        try {
            String name = Thread.currentThread().getName();
            rwlock.readLock().lock();
            Object value =null;
            System.out.println(name+"开始读取1S数据"+key+","+ value);
            value = map.get(key);
            Thread.sleep(1000);
            System.out.println(name+"结束读取1S数据"+key+","+ value);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }finally {
            rwlock.readLock().unlock();
        }
    }

    public void put(String key, Object value) {
        try {
            String name = Thread.currentThread().getName();
            rwlock.writeLock().lock();
            System.out.println(name+"开始写入1S数据，"+key+"，"+value);
            map.put(key,value);
            Thread.sleep(1000);
            System.out.println(name+"开始写入1S数据，"+key+"，"+value);
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            rwlock.writeLock().unlock();
        }
    }

    public static void main(String[] args) {
        Cache c = new Cache();
        Random r = new Random();
        for (int i = 0; i < 6; i++) {
            int temp = i;
            new Thread(() -> {
                for (int j = 0; j < 3; j++) {
                    if (r.nextInt(2) == 0) {
                        c.get("key" + temp);
                    } else {
                        c.put("key" + temp, "value" + temp);
                    }
                }
            }, "线程:"+i).start();
        }
    }
}
